CN108625931A - The effective exhaust gas processing device of low speed machine - Google Patents

Abstract

The object of the present invention is to provide the effective tail gas treatment device of low-speed machine, comprise ammonia water injection device, catalytic converter, catalytic oxidation device, cooler, particle filter, carbon dioxide adsorption box, dry box and activated carbon adsorption box connected successively, ammonia water injection device and its A liquid storage tank is arranged above the liquid storage tank, and a sprinkler head is located below the liquid storage tank. The catalytic converter includes an ammonia diffuser, an ammonia catalytic converter, and a muffler connected in sequence. The ammonia diffuser is connected to the ammonia water injection device, and the muffler is connected to the catalytic oxidation device. , the cooler is water-cooled, the particulate filter is a disposable paper filter, the inlet of the ammonia water injection device is connected to the intake pipe of the exhaust gas, and the outlet of the activated carbon adsorption box is connected to the exhaust pipe of the exhaust gas. The invention has a simple structure, can effectively remove nitrogen oxides, CO, and hydrocarbons in the exhaust gas through these technical measures, has high-efficiency filterability for particles in the exhaust gas, and can also absorb odors in the exhaust gas, so that the emission of diesel engine exhaust can reach the standard .

Description

Effective tail gas treatment device for low-speed machines

technical field

The invention relates to a tail gas treatment device, in particular to a diesel engine tail gas treatment device.

Background technique

The combustion process of a diesel engine is relatively complicated, and there are many influencing factors. Due to various reasons, it is often difficult for the fuel and air of an internal combustion engine to achieve complete combustion, and it is entirely possible to have incomplete combustion in a part or the entire combustion space. Contains incomplete combustion products and combustion intermediates. These include: carbon monoxide CO, hydrocarbons HC, nitrogen oxides NOx, sulfur dioxide SO2, particulate matter PM and aldehydes. Most of these are poisonous, or have a strong irritant, odor and carcinogenic effects, and are harmful components in the exhaust. The fuel itself also often contains other toxic substances and additives. The sum of these toxic substances is less than 1% of the total exhaust in the exhaust of diesel engines. Although the percentage of its content in the exhaust gas is not too large, with the continuous increase of the number of diesel engines, the pollution of the total emission to the atmospheric environment cannot be underestimated, and the toxic and side effects on people, things and plants are very serious. The important pollution sources that cause air pollution have become the focus and difficulty of atmospheric environmental governance, and have attracted people's attention.

Contents of the invention

The purpose of the present invention is to provide an effective tail gas treatment device for low-speed machines that can meet relevant emission standards.

The purpose of the present invention is achieved like this:

The effective tail gas treatment device of the low-speed machine of the present invention is characterized in that: it comprises sequentially connected ammonia water injection device, catalytic converter, catalytic oxidation device, cooler, particle filter, carbon dioxide adsorption box, drying oven and activated carbon adsorption box, and the ammonia water injection A liquid storage tank is arranged above the liquid storage tank, and a sprinkler head is located below the liquid storage tank. The catalytic converter includes an ammonia diffuser, an ammonia catalytic converter, and a muffler connected in sequence. The ammonia diffuser is connected to the ammonia water injection device, and the muffler is connected to the catalytic converter. The oxidation device is connected, the cooler is water-cooled, the particulate filter is a disposable paper filter, the inlet of the ammonia water injection device is connected to the intake pipe of the exhaust gas, and the outlet of the activated carbon adsorption box is connected to the exhaust pipe of the exhaust gas.

The present invention may also include:

1. The exhaust gas enters the intake pipe of the exhaust gas and flows through the ammonia water injection device. The ammonia water in the liquid storage tank is sprayed into the flowing exhaust gas through the spray head. After the exhaust gas contacts with the ammonia water, ammonia is generated and enters the catalytic converter. The ammonia in the catalytic converter diffuses The device distributes the ammonia in the exhaust gas to the surface of the ammonia catalytic converter, and the ammonia and nitrogen oxides undergo a catalytic reduction reaction in it to generate nitrogen and water. The nitrogen is directly discharged into the atmosphere, and the exhaust gas decomposed into ammonia flows through the muffler and then enters the In the catalytic oxidation device, carbon monoxide and hydrocarbons are oxidized to form carbon dioxide and water, and then flow through the cooler, and then the exhaust gas flows into the particulate filter, where the particulate matter PM is filtered, and the filtered exhaust gas enters the carbon dioxide adsorption box In the interior, carbon dioxide is absorbed, and the waste gas from which carbon dioxide is removed flows into the drying box for drying to remove the moisture contained in the waste gas, and then the waste gas enters the activated carbon adsorption box for final formaldehyde adsorption on the waste gas to remove the odor, and is discharged to the atmosphere through the exhaust pipe middle.

The advantage of the present invention is that ammonia water is contacted with diesel engine exhaust gas to produce ammonia, and a catalytic reduction reaction occurs in the catalyst to convert nitrogen oxides into harmless nitrogen and water; the diesel engine exhaust gas decomposed into nitrogen passes through a catalytic oxidation device to convert the nitrogen oxides in the exhaust gas The carbon monoxide and hydrocarbons in the exhaust gas are oxidized into carbon dioxide and water, and then the carbon dioxide in the exhaust gas is absorbed by the carbon dioxide adsorption box installed behind, and will not be discharged into the atmosphere; in addition, when the exhaust gas passes through the particulate filter, the particulate matter in the exhaust gas will be Filter out, the filter is a disposable filter element, which is more convenient to replace; the setting of the cooler can properly reduce the temperature of the exhaust gas; the setting of the drying box can remove the water produced by the chemical reaction of the exhaust gas in the catalytic converter and the oxidation device; finally, activated carbon adsorption The setting of the box can absorb the formaldehyde in the exhaust gas and remove the odor; after a series of devices, the carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter and formaldehyde in the exhaust gas are effectively removed, and can be discharged into the atmosphere through the exhaust pipe. meet emission standards.

Description of drawings

Fig. 1 is a structural schematic diagram of the present invention.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

With reference to Fig. 1, the present invention discloses a diesel engine exhaust treatment device. Diesel engine exhaust treatment device includes intake pipe 1, ammonia water injection device 2, catalytic converter 3, catalytic oxidation device 7, cooler 8, particulate filter 9, carbon dioxide adsorption box 10, drying box 11, activated carbon adsorption box 12, exhaust pipe 13 . After the exhaust gas is discharged out of the cylinder by the diesel engine, it enters the intake pipe 1 of the exhaust gas treatment device, and first flows through the ammonia water injection device 2. The ammonia water in the liquid storage tank is sprayed into the flowing exhaust gas through the nozzle; the exhaust gas and the ammonia water are fully contacted to produce ammonia. Entering the catalytic converter 3, the ammonia diffuser 4 inside the exhaust gas evenly distributes the ammonia in the exhaust gas to the surface of the ammonia catalytic converter 5, and ammonia and nitrogen oxides undergo catalytic reduction reactions in it to finally generate harmless nitrogen and water, nitrogen It can be directly discharged into the atmosphere without causing environmental damage; the waste gas decomposed into ammonia flows through the muffler 6 and then enters the catalytic oxidation device 7, where carbon monoxide and hydrocarbons are oxidized to carbon dioxide and water; then flows through the cooler 8. Reduce the temperature of the exhaust gas; then the exhaust gas flows into the particulate filter 9, and the particulate matter PM therein is filtered with high efficiency, and the particulate matter content in the filtered exhaust gas will be very low; the filtered exhaust gas enters the carbon dioxide adsorption box 10, It can absorb all the carbon dioxide in it to achieve the effect of removing carbon dioxide in the waste gas; the waste gas from which carbon dioxide is removed flows into the drying box 11 for drying to remove the moisture contained in the waste gas; after that, the waste gas comes to the activated carbon adsorption box 12 for final treatment of the waste gas Formaldehyde is adsorbed to remove odors; after a series of devices, carbon monoxide, hydrocarbons, nitrogen oxides, particulate matter and formaldehyde in the exhaust gas are effectively removed, and can be discharged into the atmosphere through the exhaust pipe 13 to meet the emission standard.

In the ammonia water injection device, the upper part is the liquid storage tank, and the lower part is the spray head. The spray heads are evenly distributed with regular round holes. The ammonia water spraying effect is similar to that of a shower, so that the ammonia water and the exhaust gas are in good contact. The cooler adopts a water-cooling method, the exhaust gas flows from the regularly arranged tubes, and water is injected between the tubes. The particulate filter element is a disposable paper filter folded into pleats. A circle of carbon dioxide adsorbent is arranged in the carbon dioxide adsorption box, and the structure of layered hydrotalcite and calcium oxide and other materials with strong CO2 adsorption properties are mainly optimized by using nanotechnology. This carbon dioxide adsorbent can not only be used in a wide temperature range , and can be regenerated and reused, which has good energy-saving and environmental protection effects.

Claims (2)

1. the effective exhaust gas processing device of low speed machine, it is characterized in that：Including the ammonium hydroxide injection device, catalyst converter, catalysis being sequentially connected Oxidation unit, cooler, particulate filter, carbon dioxide adsorption case, drying box and activated carbon adsorption case, the ammonium hydroxide injection dress It sets, fluid reservoir is arranged in top, is sprinkler head below fluid reservoir, the catalyst converter includes that ammonia diffuser, the ammonia being sequentially connected are urged Change converter, muffler, ammonia diffuser is connected with ammonium hydroxide injection device, and muffler is connected with catalytic oxidizing equipment, the cooling Device is water-cooling pattern, and the particulate filter uses disposable paper mass filter, the entrance connection tail gas of ammonium hydroxide injection device Air inlet pipe, the exhaust pipe of the outlet connection tail gas of activated carbon adsorption case.

2. the effective exhaust gas processing device of low speed machine according to claim 1, it is characterized in that：Exhaust gas enters the air inlet of tail gas Pipe, flows through in ammonium hydroxide injection device, and the ammonium hydroxide in fluid reservoir is sprayed onto through sprinkler head in the exhaust gas of flowing, exhaust gas and ammonium hydroxide contact Ammonia is generated afterwards and is entered in catalyst converter, and the ammonia diffuser of catalyst converter makes the ammonia in exhaust gas be distributed to ammonia catalytic converter surface, ammonia Nitrogen is generated through catalytic reduction reaction in it with nitrogen oxides and water, nitrogen are exhausted directly in air, decomposite the useless of ammonia Air-flow enters after muffler in catalytic oxidizing equipment, by the oxidized generation carbon dioxide of carbon monoxide and hydrocarbon and Water flows through cooler later, and exhaust gas later flows in particulate filter, is filtered to particulate matter PM therein, after filtering Exhaust gas enter in carbon dioxide adsorption case, carbon dioxide is adsorbed, go removing carbon dioxide exhaust gas flow into drying box in carry out It is dry, the moisture contained in removing exhaust gas is removed, exhaust gas enters activated carbon adsorption case later, and last formaldehyde absorbing is carried out to exhaust gas, Stink is removed, is discharged in air through exhaust pipe.